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1、小麦根系构形分布特征节根有三个发生盛期,分别与苗的三个多生长中心活动期相对应;深层根有两个生长盛期,一为越冬期间迅速下扎期,一为拔节——吐穗期间大量侧生期;根伸长速度一般为1.5±0.48cm/天;适期播种苗一般在冬季最冷期达到一生的最大根深,晚播苗在拔节期达最大根深;主根条数依土层深度单位n大致以2~(6-n)×100的方式递减。 2、越冬期间的“根苗”关系: 在太谷条件下,~(14)CO_2示踪证明冬季光合作用还在缓慢进行,而且冬季光合产物可经过40多公分的冻土层而运至继续生长着的深层根中。据数学模拟也反映出此期光照对产量的正效应最大。 3、深层根的作用: 深层根对春季返青生长几乎不起作用。自起身期以后,断深层根的比不断深层根的减产20％——56％(SSR0.05、0.01),“前功后效”作用及植株形态差异十分明显。
1, root morphology distribution characteristics of the root There are three peak occurrence period, respectively, and seedlings of the three multi-growth center corresponding to the active period; deep roots have two peak growth period, In jointing stage-a large number of lateral growth during spawning period, the root elongation rate was generally 1.5 ± 0.48 cm / day. Sowing seedlings generally reached the maximum root depth of life in the coldest period of winter and the maximum root depth of late-sowing seedlings at jointing stage. The number of main root according to soil depth unit n roughly 2 ~ (6-n) × 100 way down. The root-shoot relationship during winter: Under the condition of Taigu, ~ (14) CO_2 tracing proves that the photosynthesis in winter is still slow, and the photosynthate in winter can be transported to continue growing after more than 40 cm permafrost In the deep roots. According to mathematical simulation also reflects the current positive effects of light on the yield of the largest. 3, the role of deep roots: deep roots on spring green growth almost ineffective. Since the turn of life, deep roots deeper than the continuous deep root reduction of 20% - 56% (SSR0.05,0.01), “after-effect” effect and plant morphology is very obvious.